If you go to the emergency room with a migraine, the staff will typically give you an IV with a combination of medications designed to stop the headache quickly, usually within an hour or two. The specific mix varies by hospital, but the core approach is well established: an anti-nausea drug that also fights migraine pain, a strong anti-inflammatory, an antihistamine to prevent side effects, and often a steroid to reduce the chance the migraine comes back. Most people leave the ER feeling significantly better the same day.
The “Migraine Cocktail”
The term “migraine cocktail” refers to the combination of IV medications given together. A standard version includes four components: an anti-nausea medication (prochlorperazine is the most common choice), an anti-inflammatory pain reliever (ketorolac, which is essentially a powerful IV version of ibuprofen), an antihistamine (diphenhydramine, the same ingredient in Benadryl), and a steroid (dexamethasone). You’ll also get a bag of IV saline, since dehydration worsens migraines and many people haven’t been able to drink much fluid while nauseated.
Each drug in the cocktail has a specific job. The anti-nausea medication does double duty: drugs like prochlorperazine and metoclopramide have been shown in randomized trials to relieve migraine pain on their own, not just nausea. Ketorolac tackles inflammation and pain through a different pathway. The antihistamine is there primarily to prevent a restless, jittery feeling called akathisia, which is a known side effect of the anti-nausea drugs. And the steroid doesn’t help much with the pain you’re feeling right now, but it lowers the odds of the migraine bouncing back within the next few days.
The medications are delivered through an IV line, which means they work faster than anything you could swallow. Most people notice improvement within 30 to 60 minutes. The room will likely be kept dim and quiet, and you may feel drowsy from the antihistamine, which is actually a welcome side effect when you’re in pain.
What Happens Before Treatment
Before starting the cocktail, the ER team will assess you to make sure your headache is actually a migraine and not something more dangerous. This means a brief neurological exam: checking your pupils, your strength, your reflexes, and your ability to think clearly. They’ll ask about the headache’s onset, severity, and whether it feels different from your usual migraines.
Doctors use a set of warning signs, sometimes called “red flags,” to decide whether imaging is needed. If your headache came on like a thunderclap (reaching maximum intensity in under a minute), if you have a fever, neurological symptoms like vision loss or weakness on one side, a history of cancer, or if you’re over 65 and this is a new type of headache, they’ll likely order a CT scan. Other triggers for imaging include headaches that change with position, headaches brought on by coughing or straining, and any headache following head trauma.
If your headache fits the pattern of your usual migraines, you have a normal neurological exam, and none of those red flags are present, the American College of Radiology recommends against imaging. A CT scan in that situation rarely finds anything and exposes you to unnecessary radiation. So if the ER skips the scan, that’s actually guideline-based care, not carelessness.
If the Standard Cocktail Doesn’t Work
For most people, the first-line cocktail provides relief. But migraines that have been raging for days or that resist typical treatment sometimes need more. The ER has several options to escalate.
One approach is a nerve block. The sphenopalatine ganglion block involves placing a thin, flexible catheter just inside your nostril to deliver a numbing agent (lidocaine or bupivacaine) to a cluster of nerves behind the nasal passages. It sounds uncomfortable, but the procedure takes only a few minutes and can provide rapid relief for migraines that haven’t responded to IV medications. Some ERs also perform occipital nerve blocks, where a local anesthetic is injected at the base of the skull.
IV magnesium is another backup option, particularly for migraines with aura. Some emergency physicians will also try other anti-nausea medications from related drug classes if the first one didn’t work.
How Long the Visit Takes
Plan for two to four hours at minimum. After you’re triaged and brought to a treatment area, starting the IV and administering the medications takes 30 to 45 minutes. The staff will then monitor you for another 30 to 60 minutes to see how you respond. If you need a second round of medication or additional interventions, the visit stretches longer. ER wait times vary widely depending on how busy the department is, and migraine patients are rarely classified as the highest urgency, so waits before treatment begins can be significant.
What You’re Sent Home With
Discharge planning matters as much as the treatment itself, because migraines commonly rebound within 24 to 72 hours after an ER visit. A good discharge plan includes a short-term “bridge” medication to manage recurrence at home. This often means a prescription for a triptan (sumatriptan is the most commonly prescribed), an anti-inflammatory like naproxen, or both. Taking sumatriptan and naproxen together is more effective at preventing recurrence than either one alone. If nausea is a major part of your migraines, you may also be sent home with an anti-nausea medication in pill or suppository form.
A standing course of naproxen for several days after the ER visit can help keep the headache from flaring back up. The steroid given during your visit also helps with this, working over the next day or two to reduce the inflammatory rebound that fuels recurrence.
The ER team should also recommend that you follow up with a neurologist or headache specialist. An ER visit for migraine is a signal that your current home treatment plan isn’t adequate. A specialist can set up a better rescue plan so your next severe migraine doesn’t require another emergency visit, and can evaluate whether you’d benefit from preventive medication that reduces how often migraines occur in the first place.
What the ER Won’t Typically Do
Most emergency departments avoid prescribing opioids for migraine. Research has consistently shown that opioids are less effective than the standard cocktail for migraine pain, and they increase the risk of rebound headaches and medication overuse. If you’ve received opioids for migraines in the past, the current standard of care has moved away from that approach.
The ER also isn’t set up to manage your migraines long-term. They won’t start you on daily preventive medications or order an MRI to investigate chronic migraine patterns. Their role is to break the current attack and bridge you to outpatient care. If you’re visiting the ER for migraines more than once or twice a year, the real solution is an ongoing relationship with a headache specialist who can build a plan that keeps you out of the emergency room.